lib-storage: Convert INBOX to uppercase also when namespace has inbox=no. This fixes assert-crash in mailbox_check_mismatching_separators().
lib-storage: Convert INBOX to uppercase also when namespace has inbox=no.
This fixes assert-crash in mailbox_check_mismatching_separators().

dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot